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The Statue of Liberty is one of the seven wonders. It is present on Liberty island in New York harbour in U.S.A. It is made up of a metal. Over a period of time, the metal's colour has changed and statue gives greenish look. Answer the following questions based on the above information :
(A) What is corrosion ?
(B) Why do silver articles turn black after some time?
(C) Copper reacts with moist gas 'A' present in the air and slowly loses its shiny surface. It turns green. Identify 'A' and the substance of green coating formed on the surface of copper.
(A) What is corrosion ?
(B) Why do silver articles turn black after some time?
(C) Copper reacts with moist gas 'A' present in the air and slowly loses its shiny surface. It turns green. Identify 'A' and the substance of green coating formed on the surface of copper.
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The slow and gradual degradation of metals due to their reaction with moisture, acids etc. present in the atmosphere is called corrosion. (1 Mark)